I'm not saying it can't be done, but I'm not aware of a way to do it. Key bindings are, to the best of my knowledge, to a button as opposed to a skill. i.e. you keybind the button and it executes whatever skill is on that button, as opposed to keybinding a skill that executes no matter what button it is on. In the 4 or so years I've been playing, that's the only way I'm aware of it working.

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What people don't get is that I am, ultimately, an artist at heart. My brush has two colors, 1 and 0, and my canvas is made of silicon.